Auto jack



Dec. 18, 1928.

C. M. COFFMAN AUTO JACK Filed July 14, 192'? 2 Sheets-Sheet C'.M.C0ffma/2 ummm l atto: nur* Defn 1s, 1928.

C. M. COFFMAN AUTO JACK Fled July 14, 192'! 2 Sheets-Sheet 2 PatentedDec. 18, 1928.

irl-:D KSTAT-sa l'Jl-IiARl'i11SV M. COFFMAN, OF GALLIPOLIS, OHIO.

YAntro JACK.

Application mea J1'11y`14,

The present invention relates to jacks or i lifting devicesadaptedparticularly for use on automobiles, and has for an ob)- ect to pro videa jack, which is capable of practically complete control in both raisingand lowering the mechanism, so that the load may be i raised and loweredwith ease and at all times be under the control ofthe operator.

Another object of the invention is to provide a jack for use withballoon tires, or a jack which is capable of hoistingthroughconsiderable height and which has an axle support or rest so peculiarlyCombined with the structure ofthe jack that the rest may engage under arelatively low axle and raise the same without requiring a reduction inthe size of the parts of the jack.

A further object is to provide a jack which c has a base anda liftingpost, which are relatively small and at the' same time strong anddurable and which is provided with controlling means mounted on the baseand engaging thelifting post, sothat the latter may be raisedintermittently through some distances, Where the post may be locked atany desired height, and wherein the postk may be lowered gradually andintermittently y or where the post may be released and dropped suddenly.f c

The invention also aims at the provision of a ack which possesses theabove enumerated characteristics, and which at the same -tiine isprovided with controlling` mechanism operable from the position of theperson working the jack, and wherein the handle is utilized not only fora reciprocating motion, but also vfor a turning motion, and wherein anadditional operating` kmeans is employed, suc-h as a pull rope.

With the lforegoing and other objects in view, the invention will bemore fully dey scribed hereinafter, andwill be more particularlypointedout in the claims appended hereto. I In the drawings, whereinlike symbols refer to like or corresponding parts through out-theseveral views, Y

Figure 1 is a side elevation of a jack constructed according to thevpresent inventioin,A Y

.support for ahandle 21, whichV is forked Y atits inner end andpivotedthereat on the shaft 17. Pivoted in the bight of the han;

the handle being broken away and the jack adjusted in position about toraise a load;

Figure 2 is a horizontal section taken'v through the upper portion ofthe jack subf stantia-lly on the line 2-2 of Figure 1.

Figure 3 is a-Vfragmentary ysideelevation of the upper portion ofthejack showing the 1927. Serial No. 205,569.

lifting post in slightly raised position and showing the handle andoperating parte iny full and dotted line positions for lowering thelifting post, y

Figure l is a fragmentary side elevation of the extensible anddetachable handle for the jack, showingl the pawl releasing cam Yon theinner endof the handle.

Figure 5 is a fragmentary side elevation showing'v a modified andpreferred form of the stand or shell of the jack, and

Figure 6 is an inner edge viewv of the same.

Referring to the drawings, l() designates a hollow upright stationaryportion or base having a foot piece 11 suitably shapedto seat upon theground or roadway to support the base 10Vin upright position. y l Y Thebase 10 is hollow and opens through its upper end, and at its outer edgeis provided with a vertical slot 11a, which opens downwardly fromthefupper end of the base 10 forr receiving a rest 12, .which projectsrfrom the outer edge of a lifting post 13 disposed for vertical sliding`movement in the base 10. kA second rest A14: is provided in the shape ofahead upon the upper end vof the post 18, so that van axle, a spring` orother part of ana-utomobile may be seated lupon either the rest 12 orthe rest 14, and thel iack operated to lift the vehicle. The lifting`post 13 is provided at its inner edge with a .longitudinal row of teeth15 providing a rack bar with which meshes a pinion 16 fixed -on a shaft17, which has bearing in a pair of vspaced lugs v18, which constitutepart of the vbase 10 and extend in an edgewise direction therefrom.

The shaft 17 also carries a ratchetwheel 19, which is relatively largeAas `comparce with the pinion 16, and which extends into the base -10 atone side of the lifting'post 13, the base l()v having a lateralenlarge-` ment `2O at one sido to accommodate the ratchet wheel 19. Theratchet wheel 19 has its teeth facing in an anti-clockwise direc.

tionpso that when the post is elevated the remote side of the ratchetwheel .19 must be operated downwardly or ina clockwise direction. Theshaft 17 provides a pivot or dle y21 is a pawl 22mounted on'a transversebolt 23, which passes4 through the Ahandle 21, the pawl 22 extendingdownwardly from the handle and toward thel ratchet wheel 1Q, so as tointerlock with the teeth thereof, ae shown 1n Figures 1 and 3. The pawl22 substantiallyf-shape with its inner end any suitable length, butpreferably relatively short as it toi-ins a permanent part oit' theja-ch and is adapted to be swung;` close into the side olfA the jack, sothat the latter will occupy but sinall space. rlhe handle 21 is providedwithA a reduced shank 26 co-axially disposed upon the outer end of thehandle 21, and .which is preferably located directly beneath the weightAn extension handle is employed', the saine shown in Figure 1, andcoinprisinol a sleeve or tube 27 oi suitable length provided with abayonet slot 28 in each end, and the shanlt 26 is provided with aradially extendingv pin 2S) adapted to enter and be interloched ,in thebayonet slot 28. rllie extension handle is also provided with a* rodsection 30 adapted to enter theend of the sleeve or tube 27, andy whichcarries a radially extending* pin 31 also adapted to be inter-looked inone oit the bayonetv slots 28. The rod 30 has the pin 31 preferably onone end only, so that when the j'acl' is not in use the rod 30 inay beinserted through the tuhe 27 with the end bearing pin 31 rearinost sothat the pin 31 may' he located in the adjacent bayonet slot 28 toholdthe rod 8O within the tube 27.

@ne ond ot the tube 27 is provided at one sidev with a lifting cani 32'.The cani 32 is so positioned upon the tube 27 `that when the tuhe ismounted on the shank 26 the cani is disposed iininediately beneath thepawl arin 24, so that when the handle eX- tension or tube 27 is turnedupon the shank 2G the cani is brouglit into position to enbeneath thearin 2/1- and 'raise it. 'lhe circumferential portion ot the bayonetslot 2S so disposed to be substantially coelitensive with the Cain B2',and the pin in the shan-k 26 is so located with respect to the erin toifi `ure the correct positioning o1 the cani 32 one eide the arn'i 22.1"as to insure the `cturect positioning of the cai-n 32 to one side o'l"the arn'i 2li as the handle extension is connected to the handle. Thedeli'nite location of the pin 29 also ineures correct positioning theycano 32, so that the handle ext fon need be turn yy througl'l a relrely shortdistance to b1 in gjtlie cani the lull operate. ino" positionand' torelease the cani the weighted arin 24.

from

wheel. 19 at such an angle as tol normally n direct the xiieight andstress iinposed upon the ratchet wheel 19 iu a straightline to the pivot33. lhe lockingy pawl 311 is norinally hold in this position hy arelatively long weight arm 35, which may be enlarged or otherwisesuitably provided with a weicht l upon its tree end. It will be 'L iatthe arin 35 is relatively long nd extends down f'ardly as liar as ispractical in order toohtaiu Considerable leverage lor operating` Ithepawl Bil Ytroni a rope 37 or other suitable inea'ns for swinging' the'arin 34 inwardly away trein the base 10.

lJVloen it is desired to use the jack in raising a load, the load isplaced upon the rest 12, lor the rest 14. rlhe handle extension isplaced` upon the handle' 21 and adjusted 'so that the is at one side soas to treel the arin 211; and permit' it to urge'the paw'l 22 intoengagementy with the teeth of the ratchet wheel 19. The handle 21 is nowswung. upwardly into the position shownin Figure 1, The rope 37 islett-slack so' that the arin 35 is tree to :swing toward the hase 10 andurge the locking pawl 34 into en: gageinent with the teeth 'ot theratchet wheel 19. The handle 21 when'in raised position in interlocledwith the ratchet Wheel 19, as Afigure 1, and' the handle is now shown inl I swung downwardly upon the shaft 147 as a pivot with the result thatthe ratchet wheel is turned inacloclmise direction and pinion 16 isturned therewith and causes the lifting post 13 to slide upwardly in thehase' 10.v

' lVhen the handle 21 reaches its lloweruiost position the lockingV dogor pau/"li 34, by its arin- 35. is automatically forced intoei'i'gagenient with the toe-th of the ratchet wheel 19, so as lo holdthe latter l'i'oin turningY in a backward direction and the pawll,therefore, supports the lifting post 13' inel'evated'l position. Thehandle 21 is' now raised andI the pawl 22 freely slides over the tcethjof the ratchet wheelE until a new raised`- position el' the handle isohtaii'ied, It desired, the handle extension may be turned to operl atethe cani 32 to lift the arin 2% and withdraw the ratchet sin the ratchetwheel. 1&1 as the handle isy raised. This operation will` save wearbetween the ratchet wheel. and the ratchet. r i X vWhen it is desired tolower the load troni a raised position, the" handle 21v is' swung,"4into' a lowered position and.; witli'the p'awl 22 in engagement witl'rthe"Y ratchet iiheel 19 The handle is now firmly heldy andthe rope' isdrawn taut te swing' the arm 35 and release the locking pawl 34 troni'the lll' 21 is raised into substantially ythe position CII shown inFigure 3, whereuponthe locking pawl 34. is released so as to interlockwith the ratchet wheel 19 and'holdthe load in its new position. The cam52 is now brought into play by twisting the handle extension, so as torelease the pawl 22 from the ratchet wheel, so that the handle 21 may beswung downwardly for a new interlocking grip upon the ratchet wheel 19.l/Vhen the locking pawl 34 releases vthe ratchet wheel 19 the loadin'imedia-tely tends to turn the ratchet wheel and raise the handle 2l,so that the handle is utilized in controlling the dropping of the load.f

1f it is desiredto quickly release the load, the rope 32 is drawn tautto release the locking pawl 311-, and at the same time. the handleextension is twisted to bring thev cam 32 .against the arm 24, so thatthe pawl 22 isV also freed from the ratchet wheel`19.' The load pressingdownwardly upon the lifting post 13 is now free to force the liftingpost down and turn'both the pinion 16 and the ratchet wheel 19 withoutany restrictions.l .ln the form shown in Figures 5 and 6.

the hollow base or stand 10EL is short so as to tit beneath a spring oraxle of a vehicle and permit theuse of a relatively large pinion andratchet. In this instance the lateral enlargements 20 are substantiallytangent to the top kofthe stand and the depending lugs extend below. thecircular perimeter of the enlargements 20a.

The remaining parts mounted in the stand 1 0 are identical with theshowing in Figures l to Lt inclusive. The form shown in Figures 5 and 6is relatively low and is particularly adapted for use with small. carsequipped with balloon tires.

lt is obvious that if'arious changes and modifications may be made inthe details of construction and design of the above specificallydescribedv embodiment of this inven; tion without departing from the sp'I"'t there;l of, such changes and modifica,tionsr being resi claims. Y

lli/That is claimed is zy 1. A lifting jack comprising a base, a slidingpost mounted in the base and having a rack bar in one edge, a transverseshaft mounted at said edge of the base, a pinion on the shaftmeshingwith the rack bar, aratch-V et wheel mounted on the shaft andconnected to the pinion for turning therewithand Vhaving` its teethdisposed in an anticlockwise direction, a locking pawl carried- .ictedonly by the scope of the folloi'ving by the base and Ahaving avweightarm for normally urging` the pawl into interlocking engagement withsa-idratchet wheel, a handle pivoted upon the base concentric to said ratchetwheel, a pawl pivotally mounted on the handle for interlockingengagement with theratchet wheel and having a weight armextendinglengthwise of the handle for normally urging the pawl intointerlocking engagement with theratchet wheel, and a handle extensionmounted onfsaid handle for reciprocating` the same and adapted to. beturned, said handle extension having a cam thereon for engagementbeneath the weight arm of lsaid pawl on the handle to release the latterfrom the' ratchet wheel.

, 2. A lifting jack comprising a base open through its top and 'having avertical slot opening downwardly from said top and in one edge, alifting post slidably mounted in the base and having an edgewiseprojecting rest adapted to enter said slot when the lifting post islowered, said lifting post having a rack bar in its opposite edge, atransverse? shaft mounted in the base, a pinion on said shaft meshingwith said rack bar, a ratchet wheel carried by the shaft to turn withthe pinion, a handle pivoted on the base, a pawl mounted on the handleand having a weight arm normally urged toward the handle' forinterlocking the pawl on the handle with said ratchet wheel, a handleextension rotatably mounted on the handle and having a cam at one sideadapted for engagementbeneath said weight arm of the pawl to release thepawl from the ratchet wheel, and a locking pawl mounted upon the baseand having a Yweight arm normally urging'the pawl for interlockingengagement with said ratchet wheel, saidnwcight arms adapted -to beraised ,l

for releasing both of said pawls from the ratchet wheel to free thesame.

3. A lifting jack comprising a base, a lifting post slidablymounted inthe ase and having rack teeth in one side, said base hav inga pair oflugs projecting from said side, a shaft mounted in the lugs, a pinionvon said shaft meshing with the rack bar, a ratchet wheel on the shaftfor rotation with the pinion and projectinginto the base at one side -otsaid lifting post, a handle pivoted on said lugs, a pawl pivotallymounted in the vhandle for engagement with the' ratchet wheel and havinga weight arm extending outwardly along the handle for normally iendinoweight arm normallv urged toward Y h al n J said base for holding lthelocking pawl in of the pm'ls my be' controlled jfioi'n a distane@fem-gte from the bm.

4; A lifting jvzik Comprising a lo'llO'W base' Op'en at its real' edgeid p'iovded with lt'exal 4en'ld-gements of Circular' form dis-v posed atSubstantially a tangent to the top of the bars@ yand projecting from theapen edge th'ejdf sd @Liru'laiv lenla'fgeilrents having (l'e'pedi'gapetid lugs at the lower sides formg extnsohs 0l the optan' biased frenggmm with aid fatemi:

